The Paragon Estilleto is based on the ATKO single action out-the-front design but it's been super-sized. Just push the button and the knife fires out the front of the handle. To retract the blade press the button and use the retracing lever to pull the blade back in. The Estilleto has a pocket clip for easy tip-down carry and a safety to ensure the knife is not fired by mistake. Made in the USA and new in box.